CN109274187B - Hybrid permanent magnet rotor for electric automobile - Google Patents
Hybrid permanent magnet rotor for electric automobile Download PDFInfo
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- CN109274187B CN109274187B CN201811451389.6A CN201811451389A CN109274187B CN 109274187 B CN109274187 B CN 109274187B CN 201811451389 A CN201811451389 A CN 201811451389A CN 109274187 B CN109274187 B CN 109274187B
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- permanent magnet
- rotor
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- core
- magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The invention provides a hybrid permanent magnet rotor for an electric automobile, and belongs to the technical field of electric automobile motors. The rotor is of an inner rotor structure and comprises a first permanent magnet, a second permanent magnet, a third permanent magnet, a non-magnetic-conductive fixed core, a rotor iron core and a clamping ring, wherein the rotor iron core is fixed on the periphery of the non-magnetic-conductive fixed core; the first permanent magnets, the second permanent magnets and the third permanent magnets are the same in number and are even numbers, and are combined into h-shaped shapes. The outside of the rotor is provided with a clamping ring to prevent the rotor from deforming. Compared with the existing permanent magnet synchronous motor rotor, the permanent magnet synchronous motor rotor saves partial short rare earth permanent magnet consumption, has higher magnetic field intensity and large mechanical strength, effectively utilizes reluctance torque and has large output power.
Description
Technical Field
The invention relates to a hybrid permanent magnet rotor for an electric automobile, and belongs to the technical field of automobile motors.
Background
The problem of energy shortage in the current society is increasingly highlighted, and the call and the requirement of the whole society on energy conservation and environmental protection of new energy automobiles are increasingly promoted. Electric vehicles are becoming a major direction of development as representatives of new energy vehicles. The driving motor is one of key technologies to be researched by the electric automobile, and how to enable the electric automobile motor to run more energy-saving and efficient becomes a commonly discussed topic in the field of automobile motors. The permanent magnet synchronous motor has no excitation loss and higher efficiency, so the permanent magnet synchronous motor gradually becomes the mainstream of an automobile driving motor.
The permanent magnet synchronous motor is a motor which generates a synchronous rotating magnetic field through permanent magnet excitation. Classifying according to the structure of the permanent magnet: surface Permanent Magnet Synchronous Machines (SPMSM), Interior Permanent Magnet Synchronous Machines (IPMSM). Classifying according to the waveform of the induction potential of the stator winding: sine wave permanent magnet synchronous motor, brushless permanent magnet DC motor. The permanent magnet synchronous motor also has the advantages of large power factor, low loss, simple structure, light weight and the like. However, the permanent magnet synchronous motor has the defects of high cost, difficult starting, poor shock resistance, high total harmonic content, easy influence of armature reaction and the like.
In view of these drawbacks, some solutions for permanent magnet synchronous motors have been proposed. For example: the utility model provides a be used for high performance motor's accurate V-arrangement magnet steel structure rotor, application number: 201611054959.9, discloses a motor structure of accurate V-arrangement magnet steel, arranges traditional V-arrangement magnet steel into ill-conditioned U type structural arrangement and has added the heat dissipation passageway, has higher air gap flux density and lower total harmonic content, simultaneously effectual temperature rise problem to PMSM. The published Chinese patent: double-stator permanent magnet synchronous motor, application number: 201810235009.9 discloses a double-stator permanent-magnet synchronous motor with fractional slot concentrated windings, the double-stator windings are correspondingly staggered, so that the content of the resultant magnetomotive force and the electromotive force harmonic waves of two armatures is reduced, the eddy current loss of the permanent magnet is reduced, and the efficiency and the reliability of the motor are improved. The published Chinese patent: vehicle-mounted permanent magnet synchronous motor, application number: 201711400232.6, discloses a vehicle permanent magnet synchronous motor, which comprises a motor, a power board, a heat dissipation board and a controller. The vehicle-mounted permanent magnet synchronous motor can accelerate heat dissipation when the motor works, and circuit damage caused by local overheating is avoided.
At present, permanent magnet arrangement of a plurality of permanent magnet synchronous motor rotors adopts a built-in linear shape, a built-in V shape and a built-in U shape, and although reluctance torque can be utilized by the permanent magnet arrangement methods, adverse factors such as overlarge cogging torque, overlarge torque pulsation, easy adverse effect of armature reaction on air gap flux density and the like are brought, and the efficiency and the stability of the motor are not favorably improved.
The invention provides a hybrid permanent magnet rotor for an electric automobile on the premise of ensuring that the cost is not changed excessively and the manufacturing process is not increased in difficulty, wherein the rotor is of an inner rotor structure and comprises a first permanent magnet, a second permanent magnet, a third permanent magnet, a non-magnetic-conductive fixed core, a rotor iron core and a clamping ring, and the rotor iron core is fixed on the periphery of the non-magnetic-conductive fixed core; the first permanent magnets, the second permanent magnets and the third permanent magnets are the same in number and are even numbers, and are combined into h-shaped shapes. The outer side of the rotor is provided with a clamping ring to prevent the rotor from deforming due to centrifugal force and weaken the distortion influence of armature reaction on the waveform.
Disclosure of Invention
The invention discloses a hybrid permanent magnet rotor for an electric automobile, which is characterized in that on the basis of ensuring that the cost is not changed excessively and the manufacturing process is not increased in difficulty, a first permanent magnet, a second permanent magnet and a third permanent magnet which are the same in number and different in length are combined into an inverted h shape, a clamping ring is arranged on the outer side of the rotor to prevent deformation, meanwhile, the distortion influence of armature reaction on waveforms can be weakened, and the sine of air gap magnetic density between the rotor and a stator is adjusted. The adopted technical scheme is as follows:
a hybrid permanent magnet rotor for an electric automobile comprises a first permanent magnet, a second permanent magnet, a third permanent magnet, a non-magnetic-conduction fixed core, a rotor iron core and a clamping ring, wherein the rotor is of an inner rotor structure, and the rotor iron core is fixed on the periphery of the non-magnetic-conduction fixed core.
X first permanent magnets, X second permanent magnets and X are even numbers, wherein the first permanent magnets, the second permanent magnets and the third permanent magnets are all plane magnetic steels and are embedded in the rotor core; the second permanent magnet is in an oblique spoke shape, and the radial included angle between the second permanent magnet and the rotor is more than 20 degrees and less than 45 degrees.
The length of the first permanent magnet is smaller than that of the second permanent magnet; one end of the first permanent magnet abuts against the middle of the second permanent magnet, and the other end of the first permanent magnet is close to the adjacent third permanent magnet.
The third permanent magnet is also in an oblique spoke shape and has a radial included angle with the rotor smaller than that of the second permanent magnet; one end of the third permanent magnet is close to the outer side of the rotor core and is positioned between the two second permanent magnets, and the other end of the third permanent magnet is close to the inner side of the rotor core.
The first permanent magnet, the second permanent magnet and the third permanent magnet are integrally in a reversed h shape, the first permanent magnet and the second permanent magnet are made of neodymium iron boron permanent magnet materials, and the third permanent magnet is made of ferrite permanent magnet materials.
All the first permanent magnets have the same magnetizing direction and have the same magnetizing direction as the adjacent third permanent magnet; the second permanent magnet and the adjacent third permanent magnet are opposite in magnetizing direction.
The permanent magnet synchronous driving motor for the electric automobile is characterized in that: the outer side of the rotor iron core is provided with a high-strength steel ring for tightening.
The permanent magnet synchronous driving motor for the electric automobile is characterized in that: the second permanent magnet is divided into two sections in the middle, wherein one section close to the outer side of the rotor core is made of a ferrite permanent magnet material, and the other section close to the inner side of the rotor core is made of a neodymium iron boron permanent magnet material.
The invention has the following beneficial effects:
(1) the magnetic density of the iron core is small when the third permanent magnet is close to the third permanent magnet, and the magnetic density of the iron core is large when the second permanent magnet is close to the third permanent magnet, so that the influence of distortion of armature reaction on waveforms can be weakened, the sine of counter potential is higher, and the total harmonic content is reduced.
(2) The clamping ring is a high-strength steel ring, and can prevent the rotor from deforming under the action of centrifugal force in the high-speed rotation process.
(3) The rare earth permanent magnet consumption which is partly in short supply is saved.
(4) The excitation magnetic field is provided by the first permanent magnet, the second permanent magnet and the third permanent magnet together, the magnetic field intensity is large, and the output power is high.
(5) The first permanent magnet, the second permanent magnet and the third permanent magnet are combined into an inverted h shape, so that the magnetic gathering capacity is higher, and the efficiency is higher.
(6) The air gap flux density between the rotor and the stator is closer to sine, and the iron core loss is smaller.
Drawings
Fig. 1 shows a hybrid permanent magnet rotor diagram for an electric vehicle according to the present invention. The second permanent magnet is a section, 1, the first permanent magnet, 2, the second permanent magnet, 3, the third permanent magnet, 4, the non-magnetic-conductive fixed core, 5, the rotor iron core, 6 and the clamping ring.
Fig. 2 shows a magnetizing pattern of a hybrid permanent magnet rotor for an electric vehicle according to the present invention. 1. The permanent magnet rotor comprises a first permanent magnet, a second permanent magnet, a third permanent magnet, a rotor core, a tension hoop and a stator core, wherein the first permanent magnet is 2, the second permanent magnet is 3, the third permanent magnet is 5, and the rotor core is 6.
Fig. 3 is a structural view showing two segments of the second permanent magnet. Wherein 21, the last section of the second permanent magnet, and 22, the next section of the second permanent magnet.
Detailed description of the preferred embodiments
The invention will be further described with reference to the accompanying drawings.
The invention discloses a hybrid permanent magnet rotor diagram for an electric vehicle, which is shown in fig. 1, wherein a rotor comprises a first permanent magnet, a second permanent magnet, a third permanent magnet, a non-magnetic-conductive fixed core, a rotor iron core and a clamping ring, the rotor is of an inner rotor structure, and the rotor iron core is fixed on the periphery of the non-magnetic-conductive fixed core.
X first permanent magnets, X second permanent magnets and X are even numbers, wherein the first permanent magnets, the second permanent magnets and the third permanent magnets are all plane magnetic steels and are embedded in the rotor core; the second permanent magnet is in an oblique spoke shape, and the radial included angle between the second permanent magnet and the rotor is more than 20 degrees and less than 45 degrees.
The length of the first permanent magnet is smaller than that of the second permanent magnet; one end of the first permanent magnet abuts against the middle of the second permanent magnet, and the other end of the first permanent magnet is close to the adjacent third permanent magnet.
The third permanent magnet is also in an oblique spoke shape and has a radial included angle with the rotor smaller than that of the second permanent magnet; one end of the third permanent magnet is close to the outer side of the rotor core and is positioned between the two second permanent magnets, and the other end of the third permanent magnet is close to the inner side of the rotor core.
The first permanent magnet, the second permanent magnet and the third permanent magnet are integrally in a reversed h shape, the first permanent magnet and the second permanent magnet are made of neodymium iron boron permanent magnet materials, and the third permanent magnet is made of ferrite permanent magnet materials.
The outer side of the rotor iron core is provided with a high-strength steel ring for tightening.
As shown in fig. 2, in the magnetization directional diagram of the hybrid permanent magnet rotor for an electric vehicle according to the present invention, all the first permanent magnets have the same magnetization direction, and the magnetization direction is the same as that of the adjacent third permanent magnet; the second permanent magnet and the adjacent third permanent magnet are opposite in magnetizing direction.
As shown in fig. 3, the second permanent magnet is a two-section structure diagram, and the second permanent magnet is divided into two sections in the middle, wherein one section near the outer side of the rotor core is made of a ferrite permanent magnet material, and one section near the inner side of the rotor core is made of a neodymium iron boron permanent magnet material.
The magnetic density of the iron core is small when the third permanent magnet is close to the third permanent magnet, and the magnetic density of the iron core is large when the second permanent magnet is close to the third permanent magnet, so that the influence of distortion of armature reaction on waveforms can be weakened, the sine of counter potential is higher, and the total harmonic content is reduced.
The permanent magnets are divided into a first permanent magnet, a second permanent magnet and a third permanent magnet, the number of the three permanent magnets is the same and is even, the inverted h-shaped permanent magnets are formed, the magnetizing area and the magnetic field intensity are increased, and meanwhile the output power is increased.
The hybrid permanent magnet rotor for the electric automobile is often used in high-speed rotation occasions, and the high-strength steel ring material hoop is arranged on the outer side of the rotor, so that centrifugal force generated by high-speed rotation of silicon steel sheets can be offset, deformation of the silicon steel sheets is effectively prevented, safety is improved, and service life is prolonged.
Claims (3)
1. The utility model provides a hybrid permanent magnet rotor for electric automobile which characterized in that:
the rotor is of an inner rotor structure, and the rotor core is fixed on the periphery of the non-magnetic-conduction fixed core;
x first permanent magnets, X second permanent magnets and X are even numbers, wherein the first permanent magnets, the second permanent magnets and the third permanent magnets are all plane magnetic steels and are embedded in the rotor core; the second permanent magnet is in an oblique spoke shape, and the radial included angle between the second permanent magnet and the rotor is more than 20 degrees and less than 45 degrees;
the length of the first permanent magnet is smaller than that of the second permanent magnet; one end of the first permanent magnet abuts against the middle of the second permanent magnet, and the other end of the first permanent magnet is close to the adjacent third permanent magnet;
the third permanent magnet is also in an oblique spoke shape and has a radial included angle with the rotor smaller than that of the second permanent magnet; one end of the third permanent magnet is close to the outer side of the rotor core and positioned between the two second permanent magnets, and the other end of the third permanent magnet is close to the inner side of the rotor core;
the first permanent magnet, the second permanent magnet and the third permanent magnet are integrally in an inverted h shape, the first permanent magnet and the second permanent magnet are made of neodymium iron boron permanent magnet materials, and the third permanent magnet is made of ferrite permanent magnet materials;
all the first permanent magnets have the same magnetizing direction and have the same magnetizing direction as the adjacent third permanent magnet; the second permanent magnet and the adjacent third permanent magnet are opposite in magnetizing direction.
2. The hybrid permanent magnet rotor for an electric vehicle according to claim 1, wherein:
the outer side of the rotor iron core is provided with a high-strength steel ring for tightening.
3. The hybrid permanent magnet rotor for an electric vehicle according to claim 1, wherein:
the second permanent magnet is divided into two sections in the middle, wherein one section close to the outer side of the rotor core is made of a ferrite permanent magnet material, and the other section close to the inner side of the rotor core is made of a neodymium iron boron permanent magnet material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811451389.6A CN109274187B (en) | 2018-11-30 | 2018-11-30 | Hybrid permanent magnet rotor for electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811451389.6A CN109274187B (en) | 2018-11-30 | 2018-11-30 | Hybrid permanent magnet rotor for electric automobile |
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| Publication Number | Publication Date |
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| CN109274187A CN109274187A (en) | 2019-01-25 |
| CN109274187B true CN109274187B (en) | 2020-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811451389.6A Active CN109274187B (en) | 2018-11-30 | 2018-11-30 | Hybrid permanent magnet rotor for electric automobile |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113131631B (en) * | 2021-05-07 | 2022-11-25 | 山东理工大学 | Driving motor of electric automobile |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219814A (en) * | 2013-04-09 | 2013-07-24 | 沈阳工业大学 | Asynchronous starting permanent magnet synchronous motor rotor based on permanent magnets with different residual magnetic densities |
| CN204928396U (en) * | 2015-05-14 | 2015-12-30 | 广东美芝制冷设备有限公司 | Rotor of rotating electrical machines, permanent magnet motor , compressor, air conditioning system |
| JP2017017783A (en) * | 2015-06-26 | 2017-01-19 | 日産自動車株式会社 | Variable magnetic flux rotary electric machine |
| CN207968106U (en) * | 2017-12-21 | 2018-10-12 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotor and magneto |
| CN207968107U (en) * | 2017-12-21 | 2018-10-12 | 珠海格力电器股份有限公司 | Rotor and magneto |
-
2018
- 2018-11-30 CN CN201811451389.6A patent/CN109274187B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219814A (en) * | 2013-04-09 | 2013-07-24 | 沈阳工业大学 | Asynchronous starting permanent magnet synchronous motor rotor based on permanent magnets with different residual magnetic densities |
| CN204928396U (en) * | 2015-05-14 | 2015-12-30 | 广东美芝制冷设备有限公司 | Rotor of rotating electrical machines, permanent magnet motor , compressor, air conditioning system |
| JP2017017783A (en) * | 2015-06-26 | 2017-01-19 | 日産自動車株式会社 | Variable magnetic flux rotary electric machine |
| CN207968106U (en) * | 2017-12-21 | 2018-10-12 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotor and magneto |
| CN207968107U (en) * | 2017-12-21 | 2018-10-12 | 珠海格力电器股份有限公司 | Rotor and magneto |
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Effective date of registration: 20201111 Address after: 255049 Zibo high tech Industrial Development Zone, Shandong, A, 313 Applicant after: Shandong University of Technology Address before: 260000 Wang Siwenzhuan, Logistics Department, Shandong Vocational College of Foreign Trade, 201 Jufeng Road, Qingdao City, Shandong Province Applicant before: Shi Zhengqi |
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